package com.spzx.common.rabbit.config;

import com.spzx.common.rabbit.entity.GuiguCorrelationData;
import com.spzx.common.redis.cache.GuiguCacheAspect;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * 服务器启动时，执行rabbitTemplate初始化，设置确认函数和回退函数
 * ApplicationEvent      一些子事件的父类。
 * ApplicationReadyEvent 具体子事件。表示应用程序启动好，IOC容器初始化好，存在相关bean对象了。再进行相关的初始化。
 * 也可以使用相关的注解替代： @EventListener
 */
@Slf4j
@Component
public class RabbitInitConfigApplicationListener implements ApplicationListener<ApplicationReadyEvent> {

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    RedisTemplate redisTemplate;


    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        this.setUpInitRabbitTemplete();
    }


    private void setUpInitRabbitTemplete() {
        //确认回调函数
        rabbitTemplate.setConfirmCallback((correlationData, ack, cause) -> {
            log.info("correlationData = {}", correlationData);
            if (ack) { //消息到交换器成功
                log.info("交换机收到消息了");

            } else {  //消息到交换器失败
                log.info("交换机没收到消息 cause = " + cause);

                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                //重发消息：交换机没收到
                retrySendMsg(correlationData);
            }
        });

        //回退回调函数

        /** 发送延迟消息，导致回退毁掉函数被执行，会导致重试：   问题解决：普通消息需要重试 ，延迟消息不在重试*/
        rabbitTemplate.setReturnsCallback((returnedMessage) -> {
            log.info("returnedMessage=" + returnedMessage); //从响应消息对象头获取关联数据的id值，头名称："spring_returned_message_correlation"
            //重发消息：队列没收到  利用缓存关联的数据进行重发
            String uuid = returnedMessage.getMessage().getMessageProperties().getHeader("spring_returned_message_correlation");
            GuiguCorrelationData correlationData = (GuiguCorrelationData) redisTemplate.opsForValue().get(uuid);
            if (correlationData != null && !correlationData.isDelay()) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                retrySendMsg(correlationData);
            }

        });
    }

    /**
     * 重试方法
     *
     * @param correlationData
     */

    private void retrySendMsg(CorrelationData correlationData) {
        GuiguCorrelationData guiguCorrelationData = (GuiguCorrelationData) correlationData;

        int retryCount = guiguCorrelationData.getRetryCount();
        if (retryCount >= 3) {
            log.info("达到了最消息大的重试次数");
            return;

        }

        retryCount++;
        guiguCorrelationData.setRetryCount(retryCount);

        redisTemplate.opsForValue().set(guiguCorrelationData.getId(), guiguCorrelationData, 10, TimeUnit.MINUTES);

        rabbitTemplate.convertAndSend(
                guiguCorrelationData.getExchange(),
                guiguCorrelationData.getRoutingKey(),
                guiguCorrelationData.getMessage(),
                guiguCorrelationData);
    }

}
